Preventing text or object from reflecting in scene (blend file included)
I guess, you are doing animation, otherwise I would suggest inserting the text in GIMP or something after rendering.

With cycles and using Blender 2.82a, you can select the text and in the "Object Properties" panel under Visibility and under Ray Visibility un-check everything except Camera. This excludes your text from any reflection calculations.



Or you could put the text and a copy of the camera into a different scene and overlay it in the compositor (using an "alpha over"-node for example).